Founding Fathers Robert Morris and George Clymer Signers' Mulberry Pen # B;ATH11022This pen is from Signers' Mulberry, held to be the only still living tree planted by a signer, growing at Summerseat in Morrisville Pennsylvania. Summerseat was not only Washingtons headquarters for a time but also the home of two signers of the Declaration of Independence and the US Constitution Robert Morris and George Clymer. This pen is shades of cream and brown with dark streaks and knot crossing the top. This tree is located at 4012'29. 28"N,